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Roll-forward of c90c08ccc9
"Revert "Improvements to CMake buildsystem (#563)""
NEW:
* Replace CMAKE_SOURCE_DIR with CMAKE_CURRENT_SOURCE_DIR
Fixes #612 when yaml-cpp is used as a git submodule.
ORIGINAL:
* Move enable_testing() into proper place
* Added CMake's checks for C++11 standards
Raised minimal version of CMake to 3.1, since on old systems there no
decent compilers that supports c++11.
Closes #377.
* Externalize googletest project
Externalize gtest to avoid installation, fixes #539.
* Remove defined cmake_policies
CMP0012 - OLD marked as deprecated for >=cmake-3.1 and will be removed
CMP0015 - does not affect to build process
CMP0042 - already NEW for >=cmake-3.1
Fixes #505
* Fix compiling in Windows MSVC